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1 /* |
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2 * Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: Zoom Event Handler |
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15 * |
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16 */ |
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17 |
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18 #ifndef GLXZOOMEVENTHANDLER_H_ |
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19 #define GLXZOOMEVENTHANDLER_H_ |
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20 |
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21 #include "glxzoomview.hrh" |
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22 #include "glxfullscreenview.hrh" |
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23 #include "glxzoommathsengine.h" |
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24 |
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25 //Alf Headers |
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26 #include <alf/alfevent.h> // For Key Events |
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27 #include <alf/alftimedvalue.h> // for TAlfRealPoint |
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28 #include <alf/alftypes.h> |
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29 |
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30 #include <alf/alftypes.h> |
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31 #include <gesturehelper.h> |
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32 #include <gestureobserver.h> |
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33 |
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34 // FORWARD DECLARATIONS |
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35 class CGlxZoomControl; |
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36 class TGlxZoomAndPanMathsEngine; |
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37 class MGlxZoomEventHandlers; |
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38 |
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39 class CGlxZoomPanEventHandler : public CBase |
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40 { |
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41 public: |
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42 /** |
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43 * Two-phased constructor. |
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44 * @param aZoomEventHandler: Handler for ZoomControl commands. |
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45 */ |
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46 static CGlxZoomPanEventHandler* NewL(MGlxZoomEventHandlers& aZoomEventHandler ); |
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47 |
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48 /** |
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49 * Destructor. |
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50 */ |
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51 ~CGlxZoomPanEventHandler(); |
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52 |
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53 /** |
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54 * Two stop shop to handle all alf events. [PRASH] Make this a one stop shop |
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55 */ |
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56 TBool HandleEventL(const TAlfEvent &aEvent ); |
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57 |
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58 TBool HandleEvent( const TAlfEvent& aEvent ); |
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59 |
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60 /** |
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61 * Cancel the timer for continous zooming |
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62 */ |
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63 void CancelZoomPanTimer(); |
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64 |
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65 /* |
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66 * ActivateZoom from the Zoom control |
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67 */ |
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68 void ActivateZoom(TInt initialZoomRatio, |
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69 TSize imageSize, |
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70 TZoomStartMode aStartMode, |
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71 TInt aMinSliderRange, |
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72 TInt aMaxSliderRange, |
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73 TSize& aOriginalDimensions, |
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74 TPoint* aZoomFocus); |
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75 |
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76 /* |
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77 * DeactivateZoom from the Zoom control |
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78 */ |
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79 void DeactivateZoom(); |
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80 |
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81 /* |
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82 * OrientationChanged |
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83 */ |
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84 void OrientationChanged(const TRect& aNewScreenRect) ; |
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85 |
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86 /* |
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87 * ZoomIsActivated |
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88 * This is called when the zoom is activated/deactivated from Zoom control |
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89 */ |
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90 void SetZoomActivated(TBool aIsActivated = EFalse); |
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91 |
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92 /* |
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93 * ZoomUiState |
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94 * This is called when the zoom state in Zoom control is changed |
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95 */ |
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96 void SetZoomUiState(TUiState aZoomUiState); |
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97 |
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98 /* |
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99 * ZoomUiState |
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100 * This is called when the zoom state in Zoom control is changed |
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101 */ |
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102 TUiState ZoomUiState(); |
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103 |
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104 /** |
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105 * Handle the drag events for panning |
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106 */ |
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107 void HandleDragEvent(const GestureHelper::MGestureEvent& aEvent ); |
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108 |
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109 void HandlePinchEventL(const GestureHelper::MGestureEvent& aEvent); |
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110 |
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111 void HandleDoubleTap(const GestureHelper::MGestureEvent& aEvent ); |
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112 |
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113 void HandleSingleTap(const GestureHelper::MGestureEvent& aEvent ); |
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114 |
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115 void HandleGestureReleased(const GestureHelper::MGestureEvent& aEvent ); |
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116 |
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117 void SetPreviousEventCode(const GestureHelper::TGestureCode code ); |
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118 |
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119 void HandleMultiTouchReleased(); |
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120 |
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121 private: |
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122 /* |
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123 * Constructor |
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124 */ |
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125 CGlxZoomPanEventHandler(MGlxZoomEventHandlers& aZoomEventHandler); |
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126 |
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127 /* |
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128 * ConstructL |
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129 */ |
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130 void ConstructL(); |
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131 |
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132 /** |
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133 * This Function handles all the KeyEvents |
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134 */ |
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135 TBool HandlekeyEvents(const TAlfEvent &aEvent); |
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136 |
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137 /** |
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138 * Callback function for zoom |
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139 */ |
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140 static TInt ZoomIntervalExpired(TAny* aPtr); |
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141 |
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142 /** |
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143 * Callback function for pan |
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144 */ |
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145 static TInt PanIntervalExpired(TAny* aPtr); |
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146 |
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147 /** |
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148 * Start zoom in/out continously |
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149 */ |
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150 void DoZoom(); |
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151 |
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152 // Zoom by the next zoom increment. |
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153 // aZoomMode is ignored if aExpectedZoomLevel has a positive value |
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154 void Zoom(TInt aExpectedZoomLevel, TInt aRelativeZoomFactor, TZoomMode aZoomMode = EZoomIn, TPoint* aZoomFocus = NULL); |
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155 /** |
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156 * Start Panning continously |
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157 */ |
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158 void DoPan(); |
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159 |
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160 /** |
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161 * Starts the timer for continous zooming |
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162 */ |
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163 void StartZoomTimer(); |
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164 |
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165 /** |
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166 * Starts the timer for continous Panning |
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167 */ |
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168 void StartPanTimer(); |
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169 |
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170 /** |
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171 * Stops the timer for showing the UI. |
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172 */ |
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173 void CancelUITimer(); |
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174 |
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175 /** |
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176 * Starts the timer for showing the UI. |
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177 */ |
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178 void StartUITimer(TTimeIntervalMicroSeconds32 aDelay, |
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179 TTimeIntervalMicroSeconds32 anInterval, |
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180 TCallBack aCallBack) ; |
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181 |
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182 /** |
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183 *Call back function to Turn off UI/Screen Furniture[Back Key/Slider]. |
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184 */ |
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185 static TInt UiTimeOut(TAny* aSelf); |
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186 |
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187 /* |
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188 * Timer callback for zoomout |
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189 */ |
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190 static TInt ZoomOutTimerL(TAny* aSelf); |
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191 |
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192 /** |
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193 * Handle zoom key pressed or released. |
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194 * @param aZoomIn :ETrue for Zoom In key, EFalse for Zoom Out key |
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195 * @param aEventCode :Type of key event. |
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196 */ |
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197 void HandleZoomKey(TZoomMode aZoomMode, const TEventCode aEventCode); |
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198 |
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199 /** |
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200 * Handle the key events for panning |
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201 * @param aPanDirection: Specifies the pan direction |
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202 * @param aEvent : Specifies the event values. |
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203 */ |
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204 TBool HandlePanKey(const TAlfEvent &aEvent); |
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205 |
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206 /** |
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207 * Handle zoom stripe key pressed. |
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208 * @param aZoomIn :ETrue for Zoom In key, EFalse for Zoom Out key |
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209 * @param aEventCode :Type of key event. |
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210 */ |
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211 void HandleZoomStripeAction(TZoomMode aZoomMode ,TEventCode aEventCode); |
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212 |
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213 /** |
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214 * Handle the drag events for panning |
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215 */ |
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216 void HandleDragEvent(const TPoint &aTapPoint); |
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217 |
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218 /* |
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219 * ShowSliderTillTimeout |
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220 */ |
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221 void ShowSliderTillTimeout() ; |
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222 |
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223 /* |
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224 * ShowScreenFurniture |
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225 * aTimeout == 0 means no timeout. |
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226 */ |
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227 void ShowScreenFurniture(TTimeIntervalMicroSeconds32 aTimeout); |
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228 |
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229 /* |
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230 * HideScreenFurniture |
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231 */ |
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232 void HideScreenFurniture(); |
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233 |
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234 /* |
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235 * SetupPanOperation |
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236 */ |
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237 void SetupPanOperation(TPoint& aPanDirection); |
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238 |
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239 void CallZoomOutL(); |
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240 |
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241 void SetupAnimatedZoom(TZoomMode aZoomMode, TPoint * aZoomFocus = NULL); |
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242 |
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243 static TInt ActivationIntervalElapsed(TAny* aPtr) ; |
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244 |
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245 void NextStepAnimatedZoom(); |
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246 |
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247 void SetupAnimatedPan() ; |
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248 |
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249 static TInt PanInertiaFrameElapsed(TAny* aPtr); |
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250 |
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251 void NextStepInerticPan(); |
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252 |
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253 void CancelAnimationTimer(); |
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254 |
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255 |
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256 |
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257 private: |
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258 MGlxZoomEventHandlers& iZoomEventHandler; |
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259 |
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260 TTime iPanTime; // The Purpose of this Variable is to determine the Time,for how long the key was held |
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261 TZoomMode iZoomMode; // Says whether we are zooming in or out. |
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262 TPoint iPanDirection; // This gives the direction of the panning that has to be done |
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263 TInt iMinZoomRatio; // The minimum value that the Zoom Slider will have |
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264 TInt iMaxZoomRatio; // The maximum value that the Zoom Slider will have |
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265 |
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266 CPeriodic* iUiTimer; // The Timer used to Hide the UI/Screen Furniture[Back Key/Slider] after 2 seconds |
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267 CPeriodic* iZoomPanTimer; // The Timer used for Zooming/Panning the Image Exponentially |
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268 TPoint iStartDisplayPoint; // The variable holds the starting pointer posistion to determine the Drag Distance |
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269 TTime iDoubleTap; // This Variable is used to determine the double tap,by using the difference of the time |
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270 // between subsequent single Tap. |
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271 // [todo] do we need this variable to be global |
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272 TInt iZoomRatio; |
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273 TRect iDoubleTapRect; // This varaible holds the rect for the Double Tap |
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274 TBool iDragOngoing; // Is a drag event ongoing |
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275 TBool iZoomActivated; // To Denote if zoom is activated |
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276 TUiState iZoomUiState; // To Denote if the Ui is On in zoom |
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277 |
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278 TPoint iPreviousPointerPosition; |
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279 TPoint iPreviousDragStartPosition; |
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280 |
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281 // for the animated zoom to 50 % allowed. |
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282 TBool iIsZoomingInAnimatedState; |
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283 TAnimationMode iAnimatedZoomMode; |
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284 CPeriodic* iZoomAnimationTimer; |
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285 TInt iZoomPerInterval; |
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286 TInt iTargetAnimatedZoomRatio; |
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287 // for the animated zoom to 50 % allowed. END |
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288 |
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289 // For considering Zoom Focus. |
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290 TPoint iZoomFocus; // Not used right now. WIll soon carry the coordinates of the zoom focus. |
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291 // For considering Zoom Focus. END |
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292 |
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293 // For Pan Inertia. |
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294 GestureHelper::TGestureCode iPreviousGestureCode ; |
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295 // For Pan Inertia. END |
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296 |
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297 |
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298 |
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299 TGlxZoomAndPanMathsEngine iMathsEngine; // The new Maths engine at the core of the Zoom Component |
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300 |
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301 |
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302 }; |
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303 |
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304 |
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305 #endif /* GLXZOOMEVENTHANDLER_H_ */ |